1. Humans cause a significant amount of air pollution by burning _____ fuels?

2. What effect of air pollution is caused by CFCs from spray cans getting released into the air?

3. What effect of air pollution is caused when sulfur dioxide gets high into the atmosphere?

4. What effect of air pollution causes millions of people to die each year?

5. What color of the Air Quality Index lets us know that the air outside is 'unhealthy'?

6. What color of the Air Quality Index lets us know that the air outside is 'good'?

7. What do we call the actual gas or substance that causes air pollution?

8. What odorless gas is produced by cars and can kill you if you breathe too much of it?

9. What greenhouse gas with the chemical formula CO2 is released by the burning of fossil fuels?

10. What is the biggest single cause of air pollution?